scostep 2010 (stp12) - Leibniz-Institut für Atmosphärenphysik an der ...

STP12 Abstracts
Berlin, 12 - 16 July 2010
SCOSTEP Symposium 2010
About existence of physical boundaries between structures of one polarity on the Sun.
Ishkov Vitaly
IIZMIRAN
To one of the basic consequences active regions complexes (CAR) studying became opening
existence of boundaries between magnetic "unipolar" structures of the same polarity. These
boundaries are not defined on magnetogram received at observations of AR. Such borders
inside of active regions can be revealed at studying the dynamic phenomena, especially in
flare processes. These boundaries, in case of realization of large solar flares, interfered with
propagation of Hα flare emission to penetrates in the neighboring area. On an example of the
large solar flare in AR3804 on July, 12th, 1982 it is possible to see, that the emission ribbon
of N-polarity even during a maximum of flare does not penetration into areas of active region
laying to the north of some boundaries.. The second example gives us active region AR4263
on August - September, 1983 in which such boundaries passed between two space closely
spots of one polarity. Umbra of spots all over again settled down in one penumbra, and then
dispatch noticeably, and more east umbra, was noticeably turned counter-clockwise. If both
umbra were in one "unipolar" structure (one system), should turn there were both umbra,
however the physical border which is passed between spots, interfered with it. At the analysis
of the flares occurred in these AR, their spatial independence is well looked through: emission
of flares carried out in one system under no circumstances does not get into another. The
modern analysis shows, that coronal holes arise just in a place of “physical” boundaries
existence. From this point of view it is possible to assume that coronal holes are always
formed in unipolar magnetic structures when such structures consist of two magnetic areas of
one sign, but various origin and between them necessarily there is a "physical" boundaries. In
the solar corona where electrodynamic forces are weakened, there is a pushing away of these
parts from each other and magnetic field lines appear opened in interplanetary space.